Effect of size and indium-composition on linear and nonlinear optical absorption of InGaN/GaN lens-shaped quantum dot |
| |
Authors: | Ahmed S Jbara Zulkafli Othaman M A Saeed |
| |
Institution: | 1. Center for Sustainable Nanomaterials, Universiti Teknologi Malaysia, Skudai-81310, Johor Bahru, Malaysia;2. Physics Department, Science College, Al-Muthanna University, Samawah, Iraq;3. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Skudai-81310, Johor Bahru, Malaysia |
| |
Abstract: | Based on the Schrödinger equation for envelope function in the effective mass approximation, linear and nonlinear optical absorption coefficients in a multi-subband lens quantum dot are investigated. The effects of quantum dot size on the interband and intraband transitions energy are also analyzed. The finite element method is used to calculate the eigenvalues and eigenfunctions. Strain and In-mole-fraction effects are also studied, and the results reveal that with the decrease of the In-mole fraction, the amplitudes of linear and nonlinear absorption coefficients increase. The present computed results show that the absorption coefficients of transitions between the first excited states are stronger than those of the ground states. In addition, it has been found that the quantum dot size affects the amplitudes and peak positions of linear and nonlinear absorption coefficients while the incident optical intensity strongly affects the nonlinear absorption coefficients. |
| |
Keywords: | linear and nonlinear optical absorption coefficients lens quantum dot finite element method |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|